Mortising-machine.



UNITED STATES PATENT OFFICE.

WILLIAM L. HOLMAN, OF SAN FRANCISCO, CALlFCRNIA.

MORTISIN G-MACHINE.

SPECIFICATION forming part of Letters Patent No. 688,415, dated December 1901- Application filed August 28, 1901. Serial No. 733569. (No model.)

To all whom it may concern.-

Be it known that I, VVILLIAML. HOLMAN, re-

siding at San Francisco, county of San Francisco, and State of California, have invented crank, one to the chisel-bar, and-a third to a hydraulic piston in such a manner that the range of the chisel is moved by the hydraulic piston toward the wood to be mortised-constituting a positive means of elongating and retracting the connection between the crank and the chisel, producing the working range or stroke of the chisel-bar and depth of mortises made. i

The object of my improvement is to provide a simple and positive abutment or resistance to the toggle or extending" devices between the crank and chisel-bar of reciprocating mortising machines and control of these same. To this end I provide devices as are hereinafter described, and illustratedin the drawing forming a part of this specification, which drawing is a front elevation of a reciprocating mortising-machine constructed and operating according to my invention.

1 is the main column or frame on which the various operating parts are mounted. 2 is the crank-wheel; 3, the chisel-bar; 4, a movable carriage on which the timber 5 to be mortised is placed.

6 is a movable lever connected to the crankwheel 2 by a link 7, to the cross-head 8 by the link or links 9, and to the extension 10 of the hydraulic piston 11.

12 is a hydraulic cylinder in which the piston 11 moves, pivoted on trunnions at 13 in the bracket 14 and connected by a pipe 15 with a three-way cook 16. From the threeway cock16 a downtake-pipe 17 connects to a tank 18, and a discharge-pipe 19 extends to the top of the tank 18. The pipe 17 is provided with a check-valve 20, that prevents water from passing from the cylinder 12 force water from the cylinder 12 back into the tank 18; 27, a lever to turn the cook 16; 28, a marked sector to show the position of the cook 16, and 29 a clamp to hold the timher 5.

A, B, C, D, E, and F are pivoted points, to be hereinafter referred to.

30 is a link attached at the pivot E and to the main column 1 to control lateral movement of the piston 11 and the cylinder 12, the are described at E being compensated by the trunnions at 13.

In reciprocating mortising-machines there have been employed many devices for changing the variable length of the connection between the points A and B, all of which have hitherto, so far as I am aware, been controlled by treadles, that are disagreeable and difficult for workmen and did not ofier a rigid abutment for the toggle or other gearing. In the present invention these impediments are over come by the hydraulic piston 11. The lever 6 is set in vibration on its pivotE by the link 7, giving the chisel-bar 3 a'reciprocating motion of a range equal to the throw of the crankpivot A plus the diiference of travel of long arm D E over short arm' C E of lever D E. The extreme of the downward range of the chisel 25, as will be seen, depends on theposition of the fulcrum E. To raise this latter and project the chisel 25 downward, so as to enter the wood 5, the lever 27and cock 16 are moved so water can pass from the tank 18 through the pipe 17 and check-valve 20, the cook 16, and pipe 15 into the cylinder 12. As the gravity of the water is exceeded by the weight of the piston 11 water will not flow into the cylinder 12 when the machine is not in motion, but when in action the upward stroke of the link 7 and inertia of the parts'3, 8, and 9 cause a slight upward motion of the long end of the lever 6, raising the piston 11,which acts as a pump, drawing at each stroke a small amount of water through the let:

. how much. the cock 16 is opened. When the cut is completed, the lever 27 is moved in the opposite direction and opens communication between the cock 16 and the pipe 19, and, as-

there is no check-valve in this pipe, the downward effort of the lever 6, aided by the weight 26, sends the water in the cylinder 12 back through the pipe 19 to the tank 18, lowering the pivot E and raising the chisel 25 above and clear of the timber 5.

In cases where there is a water-supply under pressure and the Water from the cylinder 12 can be wasted the pipe 17 is connected directly to the water-supply and the pipe 19 to a Wasteway or for use at a lower point. This latter is the most common and simple manner of operating and does not require separate illustration.

It will be understood that the extension 10 of the piston 11 can pass through a stationary guide above the pivot E and the operation be the same. I have illustrated it in my present applied in pracinvention as it is at t-ice.

Having thus described my invention and the manner of its application, I claim as new and desire to secure by Letters Patent-- asset 1. In a reciprocating mortising-machinc, an intermediary lever between and connected to the crank and chisel-bar and ma hydraulic piston that raises and depresses the end of the lever,to produce the acting stroke of the chisel, and means to admit and discharge liquid from the hydraulic piston, substantially as specified.

2. In a reciprocating mortising-machine, a crank and chisel-bar, a linked and variable connection between these, a vibratory intermediary lever in this connection and a hydraulic piston to change the position of this lever and the position of the chisel-bar, and means to supply water to and exhaust it from the hydraulic piston, substantially in the manner specified.

3. In a reciprocating mortising-machine, a vibrating leverinterposed between and linked to a crank and the chisel-bar, a movable f ul- 'crum at the outer end of the lever and a hydraulic piston and cylinder to move the latter, induction and eduction pipes connecting to the hydraulic cylinder, and valves to control the flow of liquid thereto and therefrom, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. WILLIAM L. I-IOLMAN.

Witnesses:

ALFRED A. ENQUIST, J. RICHARDS. 

